Huffing and Puffing to Understand Slope

or Smoke and You Croak

Lenny VerMaas, ESU 6

Smoke and You Croak

• Handouts—will come at the end

• There is one sheet that will be completed during the activity. A clean sheet is in the handouts. Electronic copies of the handouts are on my web page.

Think About

How much air will your lung hold?

How could we measure that volume?

What will affect your lung capacity?

Scientific Vocabulary

• inspiratory reserve volume• vital volume• expiratory reserve volume• residual volume• vital capacity• total lung capacity• For exact definitions visit your friendly

science teacher.

Picture of lung capacity

Learning Vocabulary

• consider special strategies to help students learn the terms

• circle, circumference, radius, diameter, sphere, locus of points, directly proportional, and inversely proportional

How can the volume of a person’s lung be measured?

• Accurately using a spirometer

• Approximation—water displacement or blowing up a balloon.

• Estimate the Volume of Your Lung– Think of a 2 liter pop bottle.

Here is the MATH

3

3

4rV dC

A Worked Out Example

C

d 2

dr 3

3

4rV

42C 7.1342

d 7.62

7.13r

33 12517.63

4cmV

Cubic centimeters to liters

Here We Go

• Take a balloon and with one breath blow as much air as possible into the balloon.

• Measure and record the circumference of the balloon.

• Keeping the air in the balloon add another breath and measure and record the circumference.

• Add one more breath, measure and record the circumference.

Fill out the chart

Circumference Diameter RadiusVolume in

cubiccentimeters

After Breath 1

After Breath 2

After Breath 3

Measure the circumference after one breath.

Concentrate and Measure

Measure Circumference After 2nd Breath

Measure the circumference after the third

breath

How Big Can Your Balloon Go?

What to do if your balloon looks like this?

Plotting Your Data

Diameter in cm

Cir

-cu

mfe

renc

e

Radius in cm

Vol

. in

li

ter

Time to Collect Data

• Circumference vs diameter Radius vs volume

Save Your Balloon For Some More Fun

• Attach a straw and see how far and fast it will travel down a string.– Where can the straw be attached for

maximum speed and distance.– Does the length of the straw make a

difference.

• Blow up the balloon, release the balloon, measure the time in the air, plot circumference vs time in air.

Blow up the Balloon

Attach Straw Carefully to Balloon

• See how far and how fast it will travel down a string.

Down the String

• Measure the time and distance. Use this data to calculate the speed